If identical twins had babies with identical twins, would the children be biologically siblings?

Answer Biologically they'd be full siblings, if their twin parents married singlets their cousins would be biologically half siblings.

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If a girl slept with two identical twins and got pregnant, would both twins...?

I Think the Careful Analysis of the DNA (Germline), Would Reveal Some Difference. E. g., the Incorporation, of Viral DNA.

Are identical twins more common than fraternal twins?

No, about 1 in every 3 twins is an identical twin.Source:

Which is more common fraternal twins or identical twins?

Can a boy and girl be identical twins?

Identical twins are always of the same sex. This is because identical twins are monozygotic, in other words, formed from a single fertilized egg that split into two embryos. Non-identical twins are... Read More »